Resources:

Junior FIRST LEGO League:

US FIRST:
http://www.usfirst.org/roboticsprograms/jr.fll

Simple Machines

Lots of online simple machine resources:
http://pinterest.com/lifesgeodes/simple-machines/

Types of simple machines
http://www.mikids.com/Smachines.htm

LEGO Education Simple Machines
http://www.legoeducation.us/eng/categories/products/elementary/simple-machines

Animated simple machines
http://aspire.cosmic-ray.org/labs/machine/

Online animated simple machines for Gr 2 to 4:
http://www.edheads.org/activities/simple-machines/


Written description of how LEGO gears work:
http://sariel.pl/2009/09/gears-tutorial/


LEGO Gears instruction (pdf)
http://www.robodesigners.com/documents/pdf/LegoGears.pdf

LEGO Engineering from Tufts
http://legoengineering.com/index.php?option=com_content&view=article&id=136&Itemid=170

Some really good videos on gears:
http://webclass.superquest.net/sboost/movies/index.htm